(57) The invention relates to new benzazole derivatives of the formula I
wherein X is oxygen or sulphur, R₁ is lower alkyl, lower alkenyl or cycloalkyl, optionally
substituted, R₂ and R₃ independently of one another are each hydrogen, lower alkyl
or cycloalkyl radicals or taken together are a substituted or unsubstituted bivalent
hydrocarbon residue of aliphatic character in which the carbon atoms of the chain
may be interrupted by a heteroatom, R₄ is either a group
wherein R₅ and R₆ independently of one another are each hydrogen, lower alkyl or
cycloalkyl radicals, optionally substituted, or taken together R₅ and R₆ are a substituted
or unsubstituted bivalent hydrocarbon residue of aliphatic character in which the
carbon atoms of the chain may be interrupted by a heteroatom, or, R₄ is a group
where R₇ is a lower alkyl group, and their salts and N-oxides. The products are useful
as anthelmintic effective agents. The products can be prepared to methods known per
se.
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